a:8:{i:0;s:6:"cat_id";i:1;s:8:"cat_name";i:2;s:5:"intro";i:3;s:9:"parent_id";i:4;s:8:"add_time";i:5;s:9:"last_time";s:3:"_pk";s:6:"cat_id";s:5:"_type";a:6:{s:6:"cat_id";s:7:"int(11)";s:8:"cat_name";s:11:"varchar(20)";s:5:"intro";s:12:"varchar(150)";s:9:"parent_id";s:7:"int(11)";s:8:"add_time";s:16:"int(10) unsigned";s:9:"last_time";s:16:"int(10) unsigned";}}